Multiple Choice
In the study of moth populations, individuals that exhibit a greater number of dark spots than the average moth are referred to as:
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3. Extensions to Mendelian Inheritance
Understanding Independent Assortment
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Which statement is true about the nitrogenous bases found in DNA and RNA?
A
DNA contains thymine, while RNA contains uracil instead of thymine.
B
DNA and RNA both contain the same four nitrogenous bases: adenine, guanine, cytosine, and uracil.
C
RNA contains cytosine, but DNA does not.
D
Both DNA and RNA contain the nitrogenous base thymine.
Verified step by step guidance1
Recall the four nitrogenous bases found in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T).
Recall the four nitrogenous bases found in RNA: adenine (A), guanine (G), cytosine (C), and uracil (U).
Understand that thymine (T) is replaced by uracil (U) in RNA, meaning RNA does not contain thymine.
Compare the bases in DNA and RNA to identify which bases are unique to each molecule.
Conclude that the true statement is: DNA contains thymine, while RNA contains uracil instead of thymine.
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